You may want to research the carbon footprint of glass. No only for production but in the transport of goods, where heavy, relatively fragile containers require more energy to ship.
We did do extensive research, and glass came out significantly ahead in the long term, even when accounting for transport and manufacture, this is because glass is multi-use where bottles are re-used hundreds of times before needing to be replaced.
Plastic: <8% reusability via energy-intensive melting and re-shaping.
Glass: >95% reusability via washing, and of the remaining 50% > 99% can be reused via melting and re-shaping.
Over the average lifespan of a glass flask (n≈18 million), it released about 40% less CO2 equivalents compared to the amount of plastic needed to fulfil the same role.
Plastic: <8% reusability via energy-intensive melting and re-shaping.
Glass: >95% reusability via washing, and of the remaining 50% > 99% can be reused via melting and re-shaping.
Over the average lifespan of a glass flask (n≈18 million), it released about 40% less CO2 equivalents compared to the amount of plastic needed to fulfil the same role.